The other day I signed up for uptime monitoring with Pingdom for my website. I decided to find out how much downtime my own site really has. The issue of down time was brought to light after some of the other websites I administrator for work having technical issues causing downtime
The things I like about Pingdon is that you can can monitor 1 site for free and they host a public report of your sites uptime. My uptime report can be found here http://status.cloudportal.org/
If you are interested in creating a stats page for your domain have a look here http://blog.pingdom.com/2011/04/01/public-status-pages-under-your-own-custom-domain/